Malicious PDF — malware analysis report

Static analysis result for SHA-256 c82221217729dec9…

MALICIOUS

PDF

86.1 KB Created: 2021-06-17 17:17:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: c0078e94da3c3c448b69916204ecd411 SHA-1: 7edf95f302663ac703b035e2ce44a85e247679fd SHA-256: c82221217729dec9e825c6b9bf707f717d19cd99edaf8dad226042873f1b1c44
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/3s8l8kr09j8opsho6m4rhhm2tc/81307788867.pdf In PDF document text
    • http://righetti-ticozzi.it/userfiles/files/89793059594.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9ae26d6f86---bokulewepuwupolasari.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa8f8e5f0b2---dibonabavazexajatijagopul.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/samukomorizanosix.pdfIn PDF document text
    • https://liniagdanskzydowo.pl/files/70659607471.pdfIn PDF document text
    • http://asbu.net/uploads/FCK_files/file/55309774258.pdfIn PDF document text
    • http://myucmas.com/userfiles/file/mifinagi.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/794a086ef2db1a2baaaccec4c9715e46/gugugibem.pdfIn PDF document text
    • https://murderescape.com/wp-content/plugins/super-forms/uploads/php/files/fdac020db6d86af6a59e4fd4d4c62bb0/68078462434.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ca943419fe---44814303040.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160b2f35053acb---55790308570.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160b55cfd539fe---zupajefixonoje.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4ca6f514ae---xamidixomurelajo.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/lo2n1l6ifsv293hvbr4n5as599/69063967860.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160b7f696b756a---fidaxugorezizamokisiratin.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=bhojpuri+old+mp3+a+to+zPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA5C 5360 bytes
SHA-256: fb8406bb2798731c08711f213a9ecb5b0c68d77926c418b4c7107eb5d82d0902
font_01_sfnt_off00010c78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C78 10732 bytes
SHA-256: 9dfb8ded6b47cbe401bb29fbaf01a90f4c06be74ef683ada7462fd4a77aab27f
font_02_sfnt_off00013122.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13122 7716 bytes
SHA-256: a9a93b98eaab0b53df3232b5bf7fecb8a414c99620fd27956b76d6e62d85f8d8

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